code: def test_call_cpu(self):
      self._check_call()
  
file_path: chainercv/tests/links_tests/model_tests/fpn_tests/test_fpn.py
imports: from __future__ import division
  import numpy
  import unittest
  import chainer
  from chainer import testing
  from chainer.testing import attr
  from chainercv.links.model.fpn import FPN
label_desc: Use image node_id 4 for calling the TestFPN obj's underlying member method code with example usage: obj.test_call_cpu() without return types